The Stanley Classic Vacuum Water Bottle 750 ml keeps cold drinks well-tempered: up to 11 hours the drink remains cold, filled with ice cubes even up to 36 hours. This is made possible by the double-walled stainless steel vacuum insulation. The Classic Water Bottle is made of black, 18/8 stainless steel. The water bottle is leak-proof and dishwasher safe. The well-conceived lid construction allows comfortable drinking from the smaller drinking opening. However, the lid can be completely unscrewed for filling and cleaning the bottle.